1115921 has 4 divisors (see below), whose sum is σ = 1139712. Its totient is φ = 1092132.

The previous prime is 1115911. The next prime is 1115923. The reversal of 1115921 is 1295111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1115921 - 2⁶ = 1115857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1115893 and 1115902.

It is not an unprimeable number, because it can be changed into a prime (1115923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11825 + ... + 11918.

It is an arithmetic number, because the mean of its divisors is an integer number (284928).

2^1115921 is an apocalyptic number.

It is an amenable number.

1115921 is a deficient number, since it is larger than the sum of its proper divisors (23791).

1115921 is an equidigital number, since it uses as much as digits as its factorization.

1115921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23790.

The product of its digits is 90, while the sum is 20.

The square root of 1115921 is about 1056.3716202171. The cubic root of 1115921 is about 103.7236561556.

It can be divided in two parts, 111 and 5921, that multiplied together give a triangular number (657231 = T₁₁₄₆).

The spelling of 1115921 in words is "one million, one hundred fifteen thousand, nine hundred twenty-one".